> Amazing as it seems,build-up of acrylic conformal coat can cause solder joint failures.We do not allow dip coating on assemblies which have surface > mount components.We spray coat to attain a uniform thickness of 1 to 3 mils. Dewey > What are the ramifications/advisability of applying an acrylic conf coating > to a thickness of 20 mils over an assembly. The various components have this > coating under as well as over the components so that it appears "potted" > instead of coated. > > During temp cycling the solder joints on surface mount are popping. > > Susan Mansilla > Robisan Lab > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## -- Dewey Whittaker Honeywell -- Air Transport Systems Division US Mail: P.O. Box 21111 MS: M16A2 Phoenix AZ 85036 Phone: +1 602 436 436-2766 NSFnet: [log in to unmask]